Insecticide dispenser



Dec. 14, 1943. c LMDBR 23363873 INsEcTIcIDE DIsPENsER Filed Feb. 12, 1942' Patented Dec. 14, 1943 iNsEc'rIcmE DIsPNsEn Carl A. Lindberg, Toledo, Ohio, assignor to Air- Way Electric Appliance Corporation, Toledo, Ohio, a cprporation of Delaware Application February 12, 1942, Serial No. 430,640

claims. (cl. 43- -147) This invention relates to insecticide pulverizing and spraying devices and has as its general object to provide an improved device adapted to utilize the discharge air stream of a vacuum cleaner or an equivalent air current as the sole energizing means for effecting pulverization of crystals of insecticide such as paradichlorobenzene, within the device, and the subsequent spraying of the powdered insecticide from the device.

In lthe pending application of F. H. Burmeister and Ira J. Flatz, Serial Number 376,588, filed January 30, 1941, there is disclosed a device having this general object. That device employs an abrading element defining the peripheral wall of an annular abrading chamber the inner wall of which is formed by a screen. The abrading element is mounted within an oute'r casing wall. The present invention aims to simplify and renot to be construed as limitations. of the invention but only as illustrative thereof and any and all modifications, alterations and variations of duce the number of parts in a device having the general features disclosed in the aforesaid pending application. To this end, the invention con-V templates combining the functions of the abrading element and screen in a single member, thus eliminating one part and correspondingly reducing cost of materials and labor in the manufacture of the device.

Another object of the invention is to provide, in a pulverizing device of this type, an arrangement wherein the air currents fiowing through the screen element to the discharge outlet of the device, are utilized for impelling the crystals against abrading points formed on such screen element, in order to effect pulverization. The inthe abrading points, until they are funy pul-v *verized.

Other and further objects of the invention will occur to those skilled in the arts to which this invention pertains as the description proceeds which, taken in connection with the accompanying drawing, sets forth a preferred embodiment and selected modifications of the invention; but such embodiment and selected modifications are structure coming within the spirit and scope of the appended claims which limit and define the instant invention are deemed to be lincluded herein.

In the drawing:

Fig. 1 is a longitudinal sectional view of a pulverizing device embodying the invention;

Fig. 2 is a 'longitudinal sectional view of the same;

Fig. 3 is a side elevation of a portion of a vacuum cleaner with the device operatively attached thereto;

Fig. 4 is an enlarged detail sectional view of a section o f the combined screen and abrading element, and w F'ig'. 5 is a fragmentary sectional view of a modified form of the invention.

As an example of one form in which the invention may be embodied, I have shownin Figs. 1, 2 and 3 an insecticide dispenser, indicated generally at A, -adapted to be attached to a fiexible hose B connected to the blower outlet of a conventional vacuum .cleaner C.

The dispenser A comprises a housing of generally cylindrical form, including a peripheral wall Ill, and side Walls I 2 and M, the latter being in the form of a separate disc fitted within the Wall 10 and against a shoulder IS thereon. Inlet and outlet connections IB and 20 are formed integrally with the side Walls |2 and |4 respectively.

The side walls |2 and l4 are provided with annular collars.22 and 24 respectively in which are received the ends of a combined screen and abrading element 26, of cylindrical form. The collars 22 and 24 maintain the screen in concentric, spaced relation to the peripheral wall l, forming therewith an annular abrading chamber 28.

The inlet |8 is arranged to direct a crystal laden air stream tangentially in'to the chamber 28, with which it communicates through an inlet opening 29 in the peripheralA wall IO. The air stream will travel through the chamber '28 in a generally circular path as indicated by the arrows 30. The inlet |8 is constricted at its delivery end, so as to increase the Velocity of the air stream as it enters the abrading chamber.

The spent air currents will be forced inwardly by the incoming air stream, passing through the combined screen and abradin'g element 26 as indicated by the arrows 32, to an outlet opening 34 in thewall 1,4, thence through the outlet connection 20 to a distributing nozzle 3B. The voutlet connection 20 may in some casesbe permitted to function as the delivery nozzle.

The wall H is secured in assembled relation to the wall by a tie rod 38 extending through the wall of the .outlet connection and threaded at 40 into the wall |2. The rod 38 is located concentrically with relation lto the periphery of the wall M, thereby permitting the latter to be rotatably adjusted relative to the wall |0. This permits adjustment of the outlet connection relative to the housing. The adjusted position may be fixed by tightening the tie rod 38, the latter being provided with a slotted head 42 for` this purpose.

Insecticide crystals are fed into the inlet. connection |8 from a container 44, the feeding being controlled by a valve which is operated by a push button 46. This structure is the same as that illustrated in the pending application referred to above.

The hose B is attached at one end to the inlet connection |8 and at its other end to the blower connection 48 of the vacuum cleaner C.

The combined screen and abrading element 26 is constructed so as to provide a series of lapertures through which the spent air currents and fully pulverized crystal particles may pass, an'd a se- `riesl of projections against which the crystals may be 'abraded For example, the screen may be formed of sheet\metal, stamped to providela large number of conical proiections each' having the tip thereof formed with an aperture 52 as shown in detail in Fig. 4. Location of the screenapertures at the tips of the'projections minimizes clogging of the apertures.

In the operation' of the device, the-unpulverized crystals, while moving inV a generally circular path through the chamber 28 as indicated by the arrows 30, will rebound back and forth between the peripheralwall Ifl and the combined screen and abrading element 26 asindicated by the arrows 54. The inward movement of the crystals is initiated by rebound of the crystals from the peripheral wall |0 and maintained by the inward movement of the spent air currents, while the outward movement is initiated by rebound of the crystals from the combined screen and abrading element and developed by centrifugal force tending to impose a tangential direction of movement on the crystals.

plurality of screen apertures, means for directing a crystal laden airstream tangentially into said chamber, and an outlet communicating with the space within said combined screen and abrading element, the arrangement being such as to constrain said air stream to move in a generally circular path, through said chamber with the spent air currents passing inwardly through said combined screen and abrading element to said outlet and carnying pulverized crystals therewith, and to cause said .crystals to rebound back and forth between said peripheral wall and said 'combined screen and abrading element, whereby the crystals will be pulverized by contact with the abrad ing element.

2. In an insecticide pulverizing and spraying device, a housing having a substantially cylindrical peripheral wall, a combined screen and abrading. element in said housing, of .cylindrical form, spaced inwardly from said peripheral wall to define therewith an annular abrading chamber, said combined screen and abrading element being of sheet metal having a plurality of stamped pro-v jections and a plurality of screen apertures, means for directing a crystal laden air stream tangentially into said chamber, and an outlet communicating with the space within said combined screen and abrading element, the arrangement being such as to constrain said air stream to move in a generally circular path through said chamber with the spent air currents passing inwardly through said combined screen and abrading element to said outlet and carrying pulverized crystals therewith, and to cause said crystals to rebound back and forth between said peripheral wall and said combined screen and abrading element, whereby the crystals will be pulverized 'by contact with the abrading element.

In the modified form of the invention shown in i Fig. 5, the peripheral wall |0a is provided with i interior scallops 56 which are adapted to deflect the crystals inwardly, thus amplifying the rebounding action.

I claim as my invention:

1. In an insecticide pulverizing and spraying device, means defining an annular abrading chamber, said means including a combined screen and abrading element of annular form, defining the inner wall of said chamber, said combined screen and abrading element being of sheet metal having a plurality of stamped projections and av 3. In an insecticide pulverizing and spraying device, means defining an annular abrading chamber, said means including acombined screen and abrading element of annular form, defining the inner wall of said chamber,l means for directing a crystal laden air stream tangentially into said chamber, and an outlet communicating with the space within said combined screen and abrading element, the arrangemeni' being such as to constrain said air stream to move in a generally circular path, through said chamber with the 'spent air currents passing inwardly through said combined screen and abrading element to said outlet and carrying pulverized crystals therewith, and to cause said crystals to rebound back and forth between said peripheral wall and said combined screen and abrading element, whereby the crystalswill be pulverized by contact with the abrading element, said peripheral wall being interiorly scalloped to amplify the rebounding action.

4. 'The' device defined in claim 1, wherein said projections are generally conical.

v 5. The device defined in claim 1, wherein'said apertures are at thetips of said projections.

CARL A. LINDBERG. 

